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You will need to set the engine at zero timing. The cam "lock" is really a cam adjusting / alignment tool. If you wanted to prevent rotation for both sets of cams you'll need two sets and they are not cheap. Some of the more experienced members swear that the cams have to be locked with the adjusting tool at TDC or they can rotate. I'm not as experienced but as the lifters are all sitting on the cam circle at TDC I don't see why they would move. They didn't for me. If you are going to change the IMSB you'll want to retime the valves. That is 4 plugs.
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2003 S manual
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